Isaiah 56:6

And with regard to the strangers who cleave to the Lord to serve Him, and love the name of the Lord—to be His man servants and handmaids, even all who are careful not to profane My sabbaths and who adhere to My covenant;

And I will give it to the strangers that attach themselves to the Lord, to serve him, and to love the name of the Lord, to be to him servants and handmaids; and as for all that keep my sabbaths from profaning them, and that take hold of my covenant;